When I bought my laptop, Windows 10 started in UEFI boot mode. Then I boot into Windows 10 Legacy Boot Mode. Later when trying to install Windows 10 again in UEFI boot mode it cannot be installed at all. Installs only in legacy boot mode. Technicians also tried but failed to install Windows 10 in UEFI boot mode. How to install Windows 10 in UEFI boot mode?